Pronunciation (UK) IPA (key): /ɒl.tə(r)ˈeɪ.ʃən/ (US) IPA (key): /ɔl.tɚˈeɪ.ʃən/ Audio (US)(file) Noun Singular alteration Plural alterations Alteration is the act of altering or making something different.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads